Protective means for superheaters.



PATBNTED NOV. 3, 1903.

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UNITED STATES Patented November 3, 1903.

PATENT OFFICE.

FREDERIC D. POTTER, OF LINDEN, NEW JERSEY, AND ROBERT D.

JEFFREYS, OF NEW WINDSOR, NEW YORK.

PROTECTIVE MEANS FOR SUPERHEATERS.

SPECIFICATION forming part of Letters Patent No. 743,027, dated November 3, 1903. Application filed February 12, 1903. S i l Ng.'143,065. (No model.)

To all whom it may concern:

Be it known that we, FREDERIC D. POTTER, a citizen of the United States, residing in Linden, Union county, in the State of New Jersey, and ROBERT D. J EFFREYS, a subject of the King of Great Britain, residing in New Windsor, Orange county, in the State of New York, have invented a certain new and useful Improvement in Protective Means for Superheaters, of which the following is a specification. 1

This invention has relation to an improved means of the utmost simplicity for securing superheating-chambers for steam from damage by reason of excessive heat at those times when a boiler is not supplying steam thereto. It has particular relation to that type of superheater which is directly associated with the boiler which supplies the wet steam to be heated.

The accompanying drawing shows in plan View a battery of three boilers provided with a separate superheater for each boiler and further provided with the present improved protecting device.

In the drawing the steam -drums of the three boilers A, B, and C are shown at 1, 2, and 3, respectively, there being shown three drums to each boiler. From each boiler the wet steam from the drums passes through a proper pipe 4 to a main or header 5, whence short branch pipes lead the steam through superheating units, seen from above at 6 and controlled each by -its own valve 7. It is to be understood that in the drawing the outer furnace-walls are removed, and the superheaters 6 therefore occupy one side of the boiler proper. The superheated steam is led off in each case by the pipe 8, leading to the main 9, supplied by all of the boilers.

A small through -main for Wet steam is shown at 10, connected by branches 11 with each of the wet steam headers 5. These branches may or may not be provided with valves 12. The mains 9 and 10 are shown broken off at one end to indicate that they may be applied as illustrated to an indefinite number of boilers in one battery, the three being shown merely for example.

The operation of this device is as follows: When all of the boilers are in operation, the small main 10 will not usually convey any steam, since all of the wet steam headers 5 are presumably in the same condition as to pressure. It, however, one boiler-that shown at O, for instance-has to be disconnected from the header 5 and superheaters 6, these latter are protected from the dangerous heat otherwise attacking them by the passage of wet steam from the headers 5 of the boilers A and B, which, passing through the header of boiler C and thence to the superheaters thereof, keeps the latter relatively cool. It now the fire under boiler C is extinguished and the cooling efifeet is rendered unnecessary, the valve 12shuts 01f connection between the main l0 and the header 5 on the disused boiler. When the boiler C is to be again lighted and before steam has been sufficiently produced therein to protect the superheaters, the valve 12 is opened and wet steam again passes through the superheater from the other boilers.

It is evident that where a battery of boilers is used this device takes the place of flooding devices for protection of the superheaters.

The valves 12 may be made automatic in any desired. way to obviate the inconvenience of its being left open by carelessness. Indeed, as above stated, this valve is not an essential, as the amount of steam supplied through the small pipe 10, mixing with the much greater amount of superheated steam in" the main 9, would not greatly lower its temperature.

A great variety of modifications will occur to those skilled in this art, all embodying the broad principle of this invention, and this case is not to be limited to the details as shown and described herein.

What is claimed is- 1. A group of boilers, a superheater associated with each boiler, a pipe connection between each boiler aud its own superheater and an independent wet-steam main connecting tion with a wet-steam main, and connections IO the supply side of each superheater with the between said main and each of said wet-steam supply sides of all the others, substantially as headers, substantially as described.

described.

5 2. A group of boilers, a wet-steam header near each boiler directly connected with the boiler with which it is associated, and a su- Witnesses: perheater near each boiler supplied from the CHAS. F. HALSTED,

corresponding wet-steam header; in combinal H. A. MACKAYE. 

